408 lines
10 KiB
JavaScript
408 lines
10 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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class HookCodeFactory {
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constructor(config) {
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this.config = config;
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this.options = undefined;
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this._args = undefined;
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}
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create(options) {
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this.init(options);
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let fn;
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switch (this.options.type) {
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case "sync":
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fn = new Function(
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this.args(),
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'"use strict";\n' +
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this.header() +
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this.content({
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onError: err => `throw ${err};\n`,
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onResult: result => `return ${result};\n`,
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resultReturns: true,
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onDone: () => "",
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rethrowIfPossible: true
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})
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);
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break;
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case "async":
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fn = new Function(
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this.args({
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after: "_callback"
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}),
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'"use strict";\n' +
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this.header() +
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this.content({
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onError: err => `_callback(${err});\n`,
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onResult: result => `_callback(null, ${result});\n`,
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onDone: () => "_callback();\n"
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})
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);
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break;
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case "promise":
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let errorHelperUsed = false;
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const content = this.content({
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onError: err => {
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errorHelperUsed = true;
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return `_error(${err});\n`;
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},
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onResult: result => `_resolve(${result});\n`,
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onDone: () => "_resolve();\n"
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});
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let code = "";
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code += '"use strict";\n';
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code += "return new Promise((_resolve, _reject) => {\n";
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if (errorHelperUsed) {
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code += "var _sync = true;\n";
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code += "function _error(_err) {\n";
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code += "if(_sync)\n";
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code += "_resolve(Promise.resolve().then(() => { throw _err; }));\n";
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code += "else\n";
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code += "_reject(_err);\n";
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code += "};\n";
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}
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code += this.header();
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code += content;
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if (errorHelperUsed) {
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code += "_sync = false;\n";
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}
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code += "});\n";
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fn = new Function(this.args(), code);
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break;
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}
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this.deinit();
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return fn;
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}
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setup(instance, options) {
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instance._x = options.taps.map(t => t.fn);
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}
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/**
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* @param {{ type: "sync" | "promise" | "async", taps: Array<Tap>, interceptors: Array<Interceptor> }} options
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*/
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init(options) {
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this.options = options;
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this._args = options.args.slice();
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}
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deinit() {
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this.options = undefined;
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this._args = undefined;
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}
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header() {
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let code = "";
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if (this.needContext()) {
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code += "var _context = {};\n";
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} else {
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code += "var _context;\n";
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}
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code += "var _x = this._x;\n";
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if (this.options.interceptors.length > 0) {
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code += "var _taps = this.taps;\n";
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code += "var _interceptors = this.interceptors;\n";
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}
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for (let i = 0; i < this.options.interceptors.length; i++) {
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const interceptor = this.options.interceptors[i];
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if (interceptor.call) {
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code += `${this.getInterceptor(i)}.call(${this.args({
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before: interceptor.context ? "_context" : undefined
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})});\n`;
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}
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}
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return code;
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}
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needContext() {
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for (const tap of this.options.taps) if (tap.context) return true;
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return false;
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}
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callTap(tapIndex, { onError, onResult, onDone, rethrowIfPossible }) {
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let code = "";
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let hasTapCached = false;
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for (let i = 0; i < this.options.interceptors.length; i++) {
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const interceptor = this.options.interceptors[i];
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if (interceptor.tap) {
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if (!hasTapCached) {
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code += `var _tap${tapIndex} = ${this.getTap(tapIndex)};\n`;
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hasTapCached = true;
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}
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code += `${this.getInterceptor(i)}.tap(${
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interceptor.context ? "_context, " : ""
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}_tap${tapIndex});\n`;
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}
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}
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code += `var _fn${tapIndex} = ${this.getTapFn(tapIndex)};\n`;
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const tap = this.options.taps[tapIndex];
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switch (tap.type) {
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case "sync":
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if (!rethrowIfPossible) {
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code += `var _hasError${tapIndex} = false;\n`;
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code += "try {\n";
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}
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if (onResult) {
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code += `var _result${tapIndex} = _fn${tapIndex}(${this.args({
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before: tap.context ? "_context" : undefined
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})});\n`;
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} else {
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code += `_fn${tapIndex}(${this.args({
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before: tap.context ? "_context" : undefined
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})});\n`;
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}
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if (!rethrowIfPossible) {
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code += "} catch(_err) {\n";
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code += `_hasError${tapIndex} = true;\n`;
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code += onError("_err");
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code += "}\n";
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code += `if(!_hasError${tapIndex}) {\n`;
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}
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if (onResult) {
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code += onResult(`_result${tapIndex}`);
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}
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if (onDone) {
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code += onDone();
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}
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if (!rethrowIfPossible) {
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code += "}\n";
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}
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break;
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case "async":
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let cbCode = "";
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if (onResult) cbCode += `(_err${tapIndex}, _result${tapIndex}) => {\n`;
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else cbCode += `_err${tapIndex} => {\n`;
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cbCode += `if(_err${tapIndex}) {\n`;
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cbCode += onError(`_err${tapIndex}`);
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cbCode += "} else {\n";
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if (onResult) {
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cbCode += onResult(`_result${tapIndex}`);
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}
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if (onDone) {
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cbCode += onDone();
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}
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cbCode += "}\n";
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cbCode += "}";
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code += `_fn${tapIndex}(${this.args({
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before: tap.context ? "_context" : undefined,
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after: cbCode
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})});\n`;
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break;
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case "promise":
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code += `var _hasResult${tapIndex} = false;\n`;
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code += `var _promise${tapIndex} = _fn${tapIndex}(${this.args({
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before: tap.context ? "_context" : undefined
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})});\n`;
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code += `if (!_promise${tapIndex} || !_promise${tapIndex}.then)\n`;
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code += ` throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${tapIndex} + ')');\n`;
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code += `_promise${tapIndex}.then(_result${tapIndex} => {\n`;
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code += `_hasResult${tapIndex} = true;\n`;
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if (onResult) {
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code += onResult(`_result${tapIndex}`);
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}
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if (onDone) {
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code += onDone();
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}
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code += `}, _err${tapIndex} => {\n`;
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code += `if(_hasResult${tapIndex}) throw _err${tapIndex};\n`;
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code += onError(`_err${tapIndex}`);
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code += "});\n";
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break;
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}
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return code;
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}
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callTapsSeries({
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onError,
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onResult,
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resultReturns,
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onDone,
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doneReturns,
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rethrowIfPossible
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}) {
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if (this.options.taps.length === 0) return onDone();
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const firstAsync = this.options.taps.findIndex(t => t.type !== "sync");
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const somethingReturns = resultReturns || doneReturns || false;
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let code = "";
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let current = onDone;
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for (let j = this.options.taps.length - 1; j >= 0; j--) {
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const i = j;
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const unroll = current !== onDone && this.options.taps[i].type !== "sync";
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if (unroll) {
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code += `function _next${i}() {\n`;
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code += current();
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code += `}\n`;
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current = () => `${somethingReturns ? "return " : ""}_next${i}();\n`;
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}
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const done = current;
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const doneBreak = skipDone => {
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if (skipDone) return "";
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return onDone();
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};
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const content = this.callTap(i, {
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onError: error => onError(i, error, done, doneBreak),
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onResult:
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onResult &&
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(result => {
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return onResult(i, result, done, doneBreak);
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}),
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onDone: !onResult && done,
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rethrowIfPossible:
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rethrowIfPossible && (firstAsync < 0 || i < firstAsync)
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});
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current = () => content;
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}
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code += current();
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return code;
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}
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callTapsLooping({ onError, onDone, rethrowIfPossible }) {
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if (this.options.taps.length === 0) return onDone();
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const syncOnly = this.options.taps.every(t => t.type === "sync");
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let code = "";
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if (!syncOnly) {
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code += "var _looper = () => {\n";
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code += "var _loopAsync = false;\n";
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}
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code += "var _loop;\n";
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code += "do {\n";
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code += "_loop = false;\n";
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for (let i = 0; i < this.options.interceptors.length; i++) {
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const interceptor = this.options.interceptors[i];
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if (interceptor.loop) {
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code += `${this.getInterceptor(i)}.loop(${this.args({
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before: interceptor.context ? "_context" : undefined
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})});\n`;
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}
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}
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code += this.callTapsSeries({
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onError,
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onResult: (i, result, next, doneBreak) => {
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let code = "";
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code += `if(${result} !== undefined) {\n`;
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code += "_loop = true;\n";
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if (!syncOnly) code += "if(_loopAsync) _looper();\n";
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code += doneBreak(true);
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code += `} else {\n`;
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code += next();
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code += `}\n`;
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return code;
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},
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onDone:
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onDone &&
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(() => {
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let code = "";
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code += "if(!_loop) {\n";
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code += onDone();
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code += "}\n";
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return code;
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}),
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rethrowIfPossible: rethrowIfPossible && syncOnly
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});
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code += "} while(_loop);\n";
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if (!syncOnly) {
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code += "_loopAsync = true;\n";
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code += "};\n";
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code += "_looper();\n";
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}
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return code;
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}
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callTapsParallel({
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onError,
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onResult,
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onDone,
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rethrowIfPossible,
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onTap = (i, run) => run()
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}) {
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if (this.options.taps.length <= 1) {
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return this.callTapsSeries({
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onError,
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onResult,
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onDone,
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rethrowIfPossible
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});
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}
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let code = "";
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code += "do {\n";
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code += `var _counter = ${this.options.taps.length};\n`;
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if (onDone) {
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code += "var _done = () => {\n";
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code += onDone();
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code += "};\n";
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}
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for (let i = 0; i < this.options.taps.length; i++) {
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const done = () => {
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if (onDone) return "if(--_counter === 0) _done();\n";
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else return "--_counter;";
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};
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const doneBreak = skipDone => {
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if (skipDone || !onDone) return "_counter = 0;\n";
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else return "_counter = 0;\n_done();\n";
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};
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code += "if(_counter <= 0) break;\n";
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code += onTap(
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i,
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() =>
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this.callTap(i, {
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onError: error => {
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let code = "";
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code += "if(_counter > 0) {\n";
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code += onError(i, error, done, doneBreak);
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code += "}\n";
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return code;
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},
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onResult:
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onResult &&
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(result => {
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let code = "";
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code += "if(_counter > 0) {\n";
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code += onResult(i, result, done, doneBreak);
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code += "}\n";
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return code;
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}),
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onDone:
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!onResult &&
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(() => {
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return done();
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}),
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rethrowIfPossible
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}),
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done,
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doneBreak
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);
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}
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code += "} while(false);\n";
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return code;
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}
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args({ before, after } = {}) {
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let allArgs = this._args;
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if (before) allArgs = [before].concat(allArgs);
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if (after) allArgs = allArgs.concat(after);
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if (allArgs.length === 0) {
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return "";
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} else {
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return allArgs.join(", ");
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}
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}
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getTapFn(idx) {
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return `_x[${idx}]`;
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}
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getTap(idx) {
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return `_taps[${idx}]`;
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}
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getInterceptor(idx) {
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return `_interceptors[${idx}]`;
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}
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}
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module.exports = HookCodeFactory;
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